Earthquake Glossary - strong motion

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  • strong motion

    Strong motion is ground motion of sufficient amplitude and duration to be potentially damaging to a building or other structure.


    strong motion

    This turn-of-the-century wooden residence in Los Gatos sustained major damage when it moved off its foundation during the October 17, 1989, M7.1 Loma Prieta, California earthquake. (Photo by E.V. Leyendecker, U.S. Geological Survey)